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Finding the Fourth Proportional to 263.76, 393.68 and 231.36

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Solution

The fourth proportional to 263.76, 393.68 and 231.36 is: 345.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.76 : 393.68 = 231.36 : x
  2. Step 2: Convert to fraction form
    263.76/393.68 = 231.36/x
  3. Step 3: Cross multiply
    263.76x = 393.68 × 231.36
  4. Step 4: Simplify right side
    263.76x = 91,081.80
  5. Step 5: Solve for x
    x = 91,081.80/263.76
  6. Step 6: Final answer
    x = 345.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.